Infrared Home Assistant: Best Time to Add It
Yes, now is an excellent time to add infrared (IR) control to your Home Assistant server, thanks to cheap, reliable USB IR blasters, mature integrations, and the growing need to bridge older AV gear with modern smart-home automation. You can typically have a single IR blaster sending commands to your TV, soundbar, air conditioner, or set-top box within an hour, with no cloud dependency and no recurring fees.
Why Infrared Still Matters in a Smart Home
Most people assume Wi-Fi, Zigbee, and Z-Wave have made IR obsolete. But IR remains the only control method for a huge installed base of devices: televisions, projectors, AV receivers, soundbars, DVD/Blu-ray players, and many split-system air conditioners. These devices often lack any network interface, or their network features are flaky and slow. IR gives you instant, local, offline control that works even when your internet is down. It also lets you consolidate multiple remotes into one automation, so a single “movie time� scene can turn on the TV, set the receiver to the right input, dim the lights, and start the projector.
How IR Control Works with Home Assistant
Home Assistant treats IR blasters as a remote platform. You define a device (like “Living Room TV�) and then map each physical button on your original remote to a raw IR code or a Pronto hex code. When you trigger an automation, Home Assistant sends that code to the blaster, which flashes an infrared LED in the exact pattern the target device expects. The two main integration paths are:
- Broadlink RM series – Wi-Fi connected blasters (RM4 Pro, RM Mini 3) that Home Assistant controls over your LAN. They also learn codes from your original remote.
- USB IR transceivers – Devices like the USB-UIRT or the cheaper “IR Toy� style adapters that plug directly into your server’s USB port and are driven by the Linux kernel’s LIRC subsystem.
Both routes are fully local. You do not need a cloud account, and no IR command ever leaves your network.
What You Need to Get Started
To add IR to an existing Home Assistant setup you need three things:
- An IR blaster – Choose one that is supported by Home Assistant’s built-in integrations. Broadlink and LIRC are the most common.
- A way to learn codes – Either the blaster can learn from your original remote, or you can download a code database. Many TV and AC brands have community-maintained code sets.
- Line of sight – IR is line-of-sight. The blaster’s LED must be able to “see� the device’s IR receiver, or you need multiple emitters placed around the room.
If your server is in a closet or another room, you will need a blaster with an external emitter lead (a small IR LED on a wire) that you can run into the media cabinet.
Choosing the Right IR Hardware
The best choice depends on your server’s location and how many devices you need to control. For most home setups, a Broadlink RM4 Pro is a solid default: it has both IR and RF (433 MHz) blasting, works over Wi-Fi, and has a simple Home Assistant integration. If you prefer a USB device, the USB-UIRT is well supported but costs more and requires a bit more Linux knowledge. For a budget option, an ESP32 with an IR LED and the ESPHome firmware gives you full control and can be placed anywhere in the room.
Consider the number of devices and their placement. A single blaster with one emitter can only point in one direction. If your TV and soundbar face different ways, you may need a blaster with multiple emitters or several cheap blasters. Also check whether your devices use IR or RF – some ceiling fans and motorized screens use RF, which requires a different transmitter.
Common Problems and How to Solve Them
The most frequent issue is that a command works sometimes but not always. This is almost always a line-of-sight problem. IR signals bounce off walls, but they weaken with distance and can be blocked by glass or dark surfaces. Fixes include:
- Move the blaster closer to the device, ideally within 2–3 meters.
- Use an external emitter and stick it directly on the device’s IR receiver window.
- Replace the blaster’s power supply – some cheap USB adapters do not deliver enough current for steady IR output.
Another common problem is that the learned code is incomplete. When you press a button on your original remote, it may send a long burst that includes a “repeat� signal. Home Assistant’s Broadlink integration usually handles this, but if a command works only once, try learning the code again and holding the button for a full second. Also, be aware that some air conditioners use a special protocol where each temperature change sends a full state packet – you cannot simply send a “temperature up� command; you must send the entire desired state (power, mode, fan, temperature) in one code.
Costs and Alternatives
IR hardware is inexpensive. A basic Broadlink RM Mini 3 costs around $20–25, while an RM4 Pro with RF is $30–40. USB IR dongles can be found for under $15, and an ESP32 with an IR LED costs about $10 in parts. There are no subscription fees, and the Home Assistant integration is free and open-source.
Alternatives to IR include:
- HDMI-CEC – Built into most modern TVs and receivers, lets you control multiple devices over one HDMI cable. It is free but limited to CEC-compatible devices and often lacks fine control (like input selection on older gear).
- IP control – Many high-end TVs and receivers offer network control via HTTP or proprietary protocols. This is fast and reliable, but not universal and sometimes requires a paid integration.
- Zigbee/Z-Wave “smart� remotes – These control your smart home, but they cannot control a dumb TV that only accepts IR.
IR is not a replacement for these; it is a complement that fills the gaps.
Is It Safe and Reliable?
IR is completely safe – it is the same technology as your TV remote, just automated. There is no radio frequency, no network exposure, and no risk of interfering with other devices. The main reliability concern is the blaster’s power supply and the quality of the IR LED. A well-made blaster should last for years. Since everything runs locally, your automations will keep working even if your internet goes down, as long as Home Assistant itself is running.
Frequently Asked Questions
Do I need a separate IR blaster for each room?
Yes, because IR does not travel through walls. Each room with devices you want to control needs its own blaster. However, one blaster can control multiple devices in the same room, as long as they are all within line of sight.
Can I use my phone’s IR blaster instead?
Some Android phones have a built-in IR emitter, but Home Assistant does not support using a phone as a blaster directly. You would need a separate app and a bridge, which is more complex than a dedicated blaster. Dedicated hardware is simpler and always available.
Will IR control work with my air conditioner?
Most split-system ACs use IR, and many brands have well-documented codes. However, ACs often use a “state� protocol, so you must send the full desired settings (temperature, mode, fan speed) rather than a single button press. Home Assistant’s climate integration can handle this if you set up the correct commands.
Can I teach Home Assistant a code from any remote?
Yes, if your blaster supports learning. You point the original remote at the blaster and press the button; the blaster records the pattern. This works for most remotes, but some use RF or Bluetooth, which IR blasters cannot learn.
Is there a risk of breaking my devices?
No. IR is a one-way, low-power light signal. It cannot damage electronics. The worst case is that a command is ignored if the code is wrong or the signal is blocked.
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